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problem1: i need a lowpass butterworth filter whose specification are: 1-need its circuit diagram(using proteus7) 2-cutoff frequency:20hz 3- show their frequency response 5-also tell the order of filter(with explanation) At input side we have two signal(dc & ac) of 1.5v or we can say fluctuation in dc but at output of this filter we want only smooth dc signal(no matter if it is also amplified) and want to remove fluctuation due to ac signal. problem2: and after this i want to amplify 1.5dc to 12v dc,please also send the circuit diagram of 1.5v to 12v dc voltage amlifier.
You can find so many good tutorial from the web, like this one
http://www.electronics-tutorials.ws/filter/filter_8.html
Suggest you to go through it, do more research and try it out yourself.
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